A broken tailbone doesn’t produce a dramatic visible injury. From the outside, you’ll typically see bruising and swelling concentrated at the very base of the spine, just above the crease of the buttocks. Because the tailbone (coccyx) sits deep beneath layers of muscle and fat, the fracture itself isn’t something you can see or feel through the skin the way you might with a broken finger or collarbone. Most people searching this question want to know whether what they’re experiencing could be a fracture, so understanding both the external signs and what shows up on imaging is helpful.
What It Looks Like From the Outside
The most visible sign of a broken tailbone is bruising around the base of the spine. This bruising can range from a small, localized patch to a wider spread of discoloration that extends toward the buttocks. The skin may appear deep purple or blue in the first few days, then shift through green and yellow as the bruise heals. Swelling in the same area is common, though it can be subtle since the coccyx is surrounded by soft tissue that absorbs much of the inflammation.
Unlike a broken arm or leg, there’s no visible deformity. The tailbone is a small, curved bone made up of three to five fused segments tucked at the very bottom of your sacrum. Even when fractured or dislocated, it doesn’t push outward or create a lump you can see. What you will notice is intense, localized tenderness when the area is touched. A doctor performing a physical exam will find sharp pain when pressing directly over the coccyx, and in some cases, they can detect abnormal movement of the bone during a rectal exam. Normal coccyx mobility is about 13 degrees; anything well above or below that range suggests a problem.
What It Looks Like on an X-Ray
On a standard X-ray, a tailbone fracture can show up as a visible break line across one of the coccyx segments, or as an abnormal angle where the bone has shifted forward. Radiologists classify coccyx positioning into several types. A normal coccyx curves gently forward. In a Type III configuration, the bone angles sharply forward without any segment slipping out of place, which occurs in roughly 4 to 16 percent of the population. A Type IV pattern shows actual subluxation, where one segment has slipped forward at the joint, found in 1 to 9 percent of people. A Type VI pattern involves the coccyx deviating to one side, present in 1 to 6 percent of cases.
The tricky part is that X-rays don’t always tell the full story. Some of these angulations exist naturally in people who’ve never had an injury. To confirm that a fracture or dislocation is actually present, doctors often recommend a CT scan, which provides a much more detailed, three-dimensional view of the bone. Dynamic X-rays, taken while you’re sitting and then standing, can also reveal abnormal movement. Flexion greater than 25 degrees when sitting is considered hypermobile, while less than 5 degrees suggests the joint is locked in place. Both patterns are associated with pain.
What It Looks Like on an MRI
MRI scans reveal what X-rays can’t: damage to the bone marrow and surrounding soft tissues. A freshly fractured or bruised tailbone often shows bone marrow edema, which appears as a bright signal on certain MRI sequences across the entire vertebral body. This glow indicates fluid accumulation inside the bone, a hallmark of recent trauma even when no clear fracture line is visible on X-ray.
Soft tissue changes are also common. In a study of 172 patients with tailbone pain, about 23 percent showed inflammation in the tissues surrounding the lower tip of the coccyx. On MRI, this appears as a bright, somewhat blurry signal around the bone. In some cases, a well-defined bright pocket indicates a fluid-filled bursa (a small cushioning sac) that has become irritated. These soft tissue findings help explain why the area remains painful even after the bone itself begins to heal.
How It Feels Compared to a Bruise
The external appearance of a broken tailbone and a badly bruised tailbone can look identical: same bruising, same swelling, same location. The difference is in the severity and duration of symptoms. A fracture tends to produce sharper, more piercing pain, especially during transitions like going from sitting to standing. Pain during bowel movements and during sex is common with fractures. A bruise generally improves steadily over days, while a fracture stays intensely painful for weeks.
People with a broken tailbone instinctively change how they sit. You’ll find yourself leaning forward to keep weight off the back of the pelvis, or shifting to one side. Many people can only sit comfortably on a wedge-shaped or donut-style cushion that takes pressure off the coccyx. If you notice that you physically cannot sit normally without significant pain two or more weeks after an injury, that pattern is more consistent with a fracture than a simple bruise.
Healing Timeline
A fractured tailbone typically takes 8 to 12 weeks to heal. During that time, most treatment is conservative: cushioned seating, over-the-counter pain relief, and avoiding prolonged sitting. The bone heals on its own in the vast majority of cases. Surgery to remove part of the tailbone is only considered after at least 6 months of persistent pain that hasn’t responded to other treatments, and even then it’s uncommon.
Signs That Need Attention
Most tailbone fractures are painful but not dangerous. However, certain symptoms suggest something beyond a straightforward break. Pain that spreads into your hips or lower back, a fever above 103°F (39.4°C), or tailbone pain that persists long after the expected healing window are all worth getting evaluated. In very rare cases, persistent coccyx pain that doesn’t follow a clear injury can be a sign of a chordoma or other tumor near the base of the spine. This is uncommon, but it’s the reason unexplained, worsening tailbone pain shouldn’t be dismissed indefinitely.